javascript - Strange behavior while creating an image and video array (videos loading first or not at all) -


i have json feed (retrieved .ajax long polling) both movie , picture links. want "preload" images , videos, adding them array.

i want media objects added array in order in feed. have straight forward script loops through feed here encounter:

when write code add items array if specify videos first loaded front of array (ahead of images in feed added, though there images ahead of movies).

here code:

//json feed = http://app.sportstream.com/api/tagstream/tagstreamforstagetwomoderation?q=%7b%22customerid%22:%22ab.inch.2014%22,%22type%22:%7b%22$in%22:%5b%22image%22,%22video%22%5d%7d%7d&_=_   (it returns array of entries)  (var k = 0, j = entries.length; k < j; k++) {     var limit = 0;     if (idcheck.indexof(entries[k].id) == -1) {         if (++limit > 75) return;         idcheck.push(entries[k].id);          var mediaobject = new custommedia();          //placing here load videos in feed front of array          if (entries[k].type == 'video') {             mediaobject.isvideo = true;              mediaobject.url = entries[k]['ssmetadata']['videos']['standard_resolution']['url'];             console.log('new video loaded');             contentarraynew.push(mediaobject);             if (!preloaddone && boxcount != null) {                 if (contentarraynew.length >= boxcount) {                     preloaddone = true;                     imagesloaded();                 }             }             //checking if type == 'image' before video prevents videos loading         } else if (entries[k].type = 'image') {             mediaobject.isvideo = false;             mediaobject.url = entries[k]['ssmetadata']['images']['standard_resolution']['url'];              var img = new image();             img.onload = (function (entry) {                 return function () {                     contentarraynew.push(entry);                     console.log('new image loaded');                     if (!preloaddone && boxcount != null) {                         if (contentarraynew.length >= boxcount) {                             preloaddone = true;                             imagesloaded();                         }                     }                 }             })(mediaobject);             img.onerror = function () {                 console.log('error: bad image source');             };             img.src = mediaobject.url;          }  else {             console.log('invalid media format');         }     } }


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